The ranking of the top 10 IT companies in the world may have shifted due to changes in the industry. However, based on their prominence and market capitalization at that time, here are the top 10 IT companies:

1. Microsoft: Known for its software products like Windows operating system, Office Suite, and cloud services such as Azure.

2. Apple: Renowned for its consumer electronics including iPhone, iPad, Mac computers, and software services like iOS and macOS.

3. Amazon: While primarily known as an e-commerce giant, Amazon Web Services (AWS) is a leading provider of cloud computing services.

4. Alphabet (Google): Google's parent company, Alphabet, offers a wide range of services including search engine, advertising, cloud computing (Google Cloud), and software products like Android.

5. Facebook (Meta Platforms, Inc.): Along with its social networking platform, Facebook offers services like Instagram, WhatsApp, and Oculus VR.

6. Tencent: A Chinese conglomerate known for its social media and gaming platforms, as well as investments in various tech companies worldwide.

7. Alibaba Group: China's largest e-commerce company, offering online marketplaces, cloud computing (Alibaba Cloud), digital payment services, and more.

8. Tata Consultancy Services (TCS): An Indian multinational IT services and consulting company, providing a wide range of services including software development, IT consulting, and business solutions.

9. Infosys: Another prominent Indian IT services company, offering consulting, technology, and outsourcing services to clients across various industries worldwide.

10. IBM (International Business Machines Corporation): Known for its hardware, software, and consulting services, IBM has a long history in the IT industry and provides solutions in areas such as artificial intelligence, cloud computing, and cybersecurity.

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